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Debouncing limits the rate at which a function gets invoked. It ensures that a function waits a certain amount of time before running again. javascript

A is the combination of a function bundled together with references to its surrounding state (the lexical environment). In simple terms, a closure gives an inner function access to the outer function’s scope even after the outer function has returned. javascript

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== is the abstract equality operator, which performs type coercion before comparing. === is the strict equality operator, which compares both the value and the type without coercion. For example, 5 == "5" is true , but 5 === "5" is false . Q2: What is the difference between var , let , and const ?

Questions are typically divided into logical sections such as Basics (variables, data types), Advanced (closures, promises, event loop), and Coding Challenges. Top JavaScript Interview Topics Covered JavaScript Interview Masterclass: Top 300 Questions (2026) Debouncing limits the rate at which a function gets invoked

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function createCounter() let count = 0; return function() count++; return count; ; const counter = createCounter(); console.log(counter()); // 1 console.log(counter()); // 2 Use code with caution. In simple terms, a closure gives an inner

function createCounter() let count = 0; // Private variable return function() count++; return count; ; const counter = createCounter(); console.log(counter()); // 1 console.log(counter()); // 2 Use code with caution. 4. Advanced Scope, Shadowing, and Illegal Shadowing

Creating private variables that cannot be modified directly from the outside.